Chrome Steel Ball AISI52100/SUJ-2 1) Chrome Steel AISI52100 2) Size: 0.5mm-50.8mm 3) Grade: G5-G100 4) Hardness: HRC62-65 5) Certificate: ISO-9001,TS-16949, ISO14001 6) Feature: Good wearing, excellent surface quality and high hardness. 7) Application: Bearing, ball screw, linear motion guide, automotive parts, chemical, food processing, ink and paint grinding, caster wheel, slide rail bicycle and car.